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-rw-r--r--mesalib/src/glsl/pp/sl_pp_extension.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/mesalib/src/glsl/pp/sl_pp_extension.c b/mesalib/src/glsl/pp/sl_pp_extension.c
new file mode 100644
index 000000000..d119677c2
--- /dev/null
+++ b/mesalib/src/glsl/pp/sl_pp_extension.c
@@ -0,0 +1,178 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include "sl_pp_context.h"
+#include "sl_pp_process.h"
+#include "sl_pp_public.h"
+
+
+/**
+ * Declare an extension to the preprocessor. This tells the preprocessor
+ * which extensions are supported by Mesa.
+ * The shader still needs to have a "#extension name: behavior" line to enable
+ * the extension.
+ */
+int
+sl_pp_context_add_extension(struct sl_pp_context *context,
+ const char *name)
+{
+ struct sl_pp_extension ext;
+
+ if (context->num_extensions == SL_PP_MAX_EXTENSIONS) {
+ return -1;
+ }
+
+ ext.name = sl_pp_context_add_unique_str(context, name);
+ if (ext.name == -1) {
+ return -1;
+ }
+
+ context->extensions[context->num_extensions++] = ext;
+
+ assert(context->num_extensions <= sizeof(context->extensions));
+
+ return 0;
+}
+
+
+/**
+ * Process a "#extension name: behavior" directive.
+ */
+int
+sl_pp_process_extension(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last,
+ struct sl_pp_process_state *state)
+{
+ int extension_name = -1;
+ int behavior = -1;
+ struct sl_pp_token_info out;
+
+ /* Grab the extension name. */
+ if (first < last && input[first].token == SL_PP_IDENTIFIER) {
+ extension_name = input[first].data.identifier;
+ first++;
+ }
+ if (extension_name == -1) {
+ strcpy(context->error_msg, "expected identifier after `#extension'");
+ return -1;
+ }
+
+ /* Make sure the extension is supported. */
+ if (extension_name == context->dict.all) {
+ out.data.extension = extension_name;
+ } else {
+ unsigned int i;
+
+ out.data.extension = -1;
+ for (i = 0; i < context->num_extensions; i++) {
+ if (extension_name == context->extensions[i].name) {
+ out.data.extension = extension_name;
+ break;
+ }
+ }
+ }
+
+ /* Grab the colon separating the extension name and behavior. */
+ while (first < last && input[first].token == SL_PP_WHITESPACE) {
+ first++;
+ }
+ if (first < last && input[first].token == SL_PP_COLON) {
+ first++;
+ } else {
+ strcpy(context->error_msg, "expected `:' after extension name");
+ return -1;
+ }
+ while (first < last && input[first].token == SL_PP_WHITESPACE) {
+ first++;
+ }
+
+ /* Grab the behavior name. */
+ if (first < last && input[first].token == SL_PP_IDENTIFIER) {
+ behavior = input[first].data.identifier;
+ first++;
+ }
+ if (behavior == -1) {
+ strcpy(context->error_msg, "expected identifier after `:'");
+ return -1;
+ }
+
+ if (behavior == context->dict.require) {
+ if (out.data.extension == -1) {
+ strcpy(context->error_msg, "the required extension is not supported");
+ return -1;
+ }
+ if (out.data.extension == context->dict.all) {
+ strcpy(context->error_msg, "invalid behavior for `all' extension: `require'");
+ return -1;
+ }
+ out.token = SL_PP_EXTENSION_REQUIRE;
+ } else if (behavior == context->dict.enable) {
+ if (out.data.extension == -1) {
+ /* Warning: the extension cannot be enabled. */
+ return 0;
+ }
+ if (out.data.extension == context->dict.all) {
+ strcpy(context->error_msg, "invalid behavior for `all' extension: `enable'");
+ return -1;
+ }
+ out.token = SL_PP_EXTENSION_ENABLE;
+ } else if (behavior == context->dict.warn) {
+ if (out.data.extension == -1) {
+ /* Warning: the extension is not supported. */
+ return 0;
+ }
+ out.token = SL_PP_EXTENSION_WARN;
+ } else if (behavior == context->dict.disable) {
+ if (out.data.extension == -1) {
+ /* Warning: the extension is not supported. */
+ return 0;
+ }
+ out.token = SL_PP_EXTENSION_DISABLE;
+ } else {
+ strcpy(context->error_msg, "unrecognised behavior name");
+ return -1;
+ }
+
+ /* Grab the end of line. */
+ while (first < last && input[first].token == SL_PP_WHITESPACE) {
+ first++;
+ }
+ if (first < last) {
+ strcpy(context->error_msg, "expected end of line after behavior name");
+ return -1;
+ }
+
+ if (sl_pp_process_out(state, &out)) {
+ return -1;
+ }
+
+ return 0;
+}